Power unit



Jan. 2, 1945. BQHN F 2,366,172

POWER UNIT Filed March 25, 1942 3 Sheets-Sheet 1 3 vwa/Mom Z'mf/Z'. Bob/v,

I m, %%m @Aiazma Jan. 2, 1945. E. E. BOHN 2,366,172

POWER UNI T Filed March 25, 1942 3 Sheets-Sheet 2 Emi/ .5. 50/7/7 E. E. BC'JHN 2,366,172

POWER UNIT Filed March 25, '1942 s Sheets-Sheet 3 5 a i, z A M h3g1 w J 5 9 .Lvfl 12 5 5 m Jan. 2,1945,

Emi/ Z. 50/7/2 described and claimed.

Patented Jan. 2, 1945 2,366,172 7 rowan UNIT Emil E. Bohn, Amarillo, Tex. Application March 25, 1942, Serial No. 436,213

1 Claim.

This invention relates to a power press of the character including a support for the work and a tool carriage slidable on the support and on which the tool for actuation on the work and its power means is mounted. The primary object of the invention is the provision of an efficient reversible drive between a power means on the support and the carriage whereby the lattermay be made toslide in oppositedirections to adjust the tool relative. to the work and to releasably secure the carriage in various adjusted positions.

With these and other objects in view as will become more apparent as the description proceeds. the invention consists in certain novel features of construction, combination and arrangement of parts as will be hereinafter more fully For a complete understanding of my invention, reference is to be had to the following decription and accompanying drawings, in which Figure 1 is a front elevation illustrating a power unit constructed in accordance with my invention.

Figure 2 is a sectional view taken on the line 2-2 of Figure l.

Figure 3 is a transverse sectional view taken on the line 33 of Figure 1.

Figure 4 is a sectional view taken on the line 44 of Figure 1. y

Figure 5 is a sectional view taken on the line 55 of Figure 4.

Figure 6 is a'fragmentary sectional view illustrating a train of gears for the drive between a power source and a tool operating shaft.

Figure 7 is a fragmentary sectional view illustrating gears whereinone of the gears includes a ratchet mechanism.

work supported by the work holder I.

The shaft I8 may be rotated in oppositedirec- Referring in detail to the drawings, the numeral 5 indicates a vertically arranged supporting frame including a base 6 carrying-a work holder I and vertical track-forming members 8 connected at their upper ends by a cross member or head 9.

Mounted for vertical sliding movement in opposite directions on the frame 5 is a carriage Ill. Carried by the carriage III to move therewith and relative thereto, is a tool holder ll. Also carried by the carriage is a power actuated drive mechanism l2 for the tool holder l I.

The carriage cross members i3 and I4 integrally connected with vertically arranged track-engaging. members l5 that slide freely on the track members or portions 8 of the main frame 5 and include slots [8, walls of which have formed thereon rack ill includes upper and lower teeth I! engaged by pinions 18 secured to a power driven shaft 19 journaled in bearings provided in the track members 8 of the main frame. The rotation of the shaft I 9 in opposite directions will bring about raising and lowering of the carriage on the main frame Sand the adjustment of'the tool carriedyby the tool holder ll relative to the tions by a power mechanism which will'be hereinafter described in detail.

Journaled on the carriage l0 between the upperand lower members l3 and H by suitable bearings provided therefor is a power shaft 20 on which .is secured an eccentric 2i engaged by an eccentric strap 22 forming a part of a connecting rod 23. The eccentric strap 22 is sectional to permit the application and removal of the connecting rod to the eccentric. A wrist pin 24 connects the connecting rod 23 to the tool holder l I, the latter being slidably mounted in the lower member I of the carriage. The tool holder ll may be of any desired construction so that a selected type of tool may be easily and quickly adapted thereto and removed therefrom whe desired. A variable speed transmission 25 of a conventional construction is mounted on the upper member l3 of the carriage l0 and is connected to the shaft 20 by a train of gears 28. A manually operated clutch 21 connects the transmission to a power source 28 mounted on the upper member ii of the carriage and which may be of any selected type, in this instance shown'as-being an electric motor. 7 Y

The variable transmission permits driving of the shaft 20 at different rates of speed and in opposite directions. However, for the successful operation of the tool holder, it is only necessary that the shaft 201 be rotated in one direction. There may be conditions arising when operating on certain kinds of work that make it desirable to rotate the shaft 20 in opposite directions.

.Therefore, it will be well to have the variable speed transmission of the type which will allow reverse motion to the shaft 20 when desired. The rotation of the eccentric It will bring about reciprocation of the tool holder II on the carriage and the tool supported thereby relative to the work supported by the work holder 1.

A suitable scale plate 30 is applied to the can riage Ill and a pointer 3| is secured to the main frame 5 and cooperates with the scale plate so that a person or operator of the device may readily determine by measurement the relation aaearra of the tool holder and its tool with respect to th essary, as before stated, to rotate the shaft it in opposite directions as well as to secure said shaft against rotation in one direction and also in both directions. 7 Also, it will be desirable to rotate said shaft l at different rates of speed and from a power source under direct manual control. Also, it will be desirable during certain phases of operation of this power unit to lower the carriage by gravity. All of these stated operations of the carriage may be easily and quickly carried out through a mechanism which will now be described in detail.

Said mechanism includes a power source 32 mounted on a bracket 33 secured to the main frame 5. The power source 32 is connected to a variable speed transmission 34 by a manually operated clutch 35. The transmission 34 also is manually controlled and the power takeoff gear thereof is indicated by the character 35 located within a suitable gear housing 31 supported by the bracket 33. The power takeoff gear-35 is in continuous mesh with gears 35 and 39, the gear 33 acting as an idler and is journaled on a shaft 45 carried by the gear housing 31. z The gear 33 is joumaled on a shaft 4| rotatably supported in the gear housing 31. The gear 35 has associ-' ated therewith a clutch 42, one of the elements thereof being fixed to the gear. 35 while the other element is keyed to the shaft 4|.

A gear 43 is in continuous mesh with the gear 33 journaled on a shaft 44 rotatably supported in the gear housing 31. Associated with the gear 43 is a ,clutch 45, one element thereof being fixed to the gear 43 and the other element being keyed to the shaft 44. A hand controlled lever 45 is provided for the alternate operation of the clutches 42 and 45 and is pivotally mounted on the gear housing 31 and has a neutral position as well as a position for engaging the clutch 45 and another position for the engaging of the clutch 42.

Links 41 are pivoted to the control lever 45 and to hell crank levers 45 pivotally mounted inthe gear housing 31. One of the bell crank levers 45 is connected to the keyed element of the clutch 45, while the other bell crank lever is connected to the keyed element of the clutch 42. The power takeofl gear 35 rotates the gears 33 and 43 in the direction, indicated by the arrows in Figure 4 applied to said gears 35 and 43.

Agear 50 is journaled on the shaft 4| and meshes continuously with a gear 5| secured to the shaft IS. A gear 52 is in continuous mesh with the gear 5| and is secured to the shaft 44. The drive between the shaft 44 and the gear 5| may be interrupted by the clutch 45. The gear 55 has formed thereon a brake drum 55 provided band 59 pivotally mounted in the gear housing 3?, as shown at 55. One-end of each of the brake bands55 and 53 has a 'iixed pivot, as shown at H 5i. The other endsof-the brake bands are pivwith ratchet teeth 54 engaged by spring influenced a 55 bythe shaft 4| in the direction indicated by the arrow applied to said gear 55 in Figure 4.

The shaft 4| may be clutched and declutched to the gear 38 which is driven by the power takeoff gear 35. A brake drum 55 is secured to the shaft 44 and coactive therewith is a split type brake otally connectedto bell crank levers 52. The bell crank levers 52 are. mounted for pivotal movement on the pivot 5] and links 54 are pivotally connected thereto. The links 54 are pivotally connected to a control lever 53 pivotally mounted in the gear housing. The brake drums described form'brakes for the shafts 4| and 44,

which brakes may be alternatingly operated by the control lever 63, the latter having a neutral position wherein the brake bands both are released from their respective brake drums.

When it is desired to drive the carriage l5 downwardly by power, the clutch 35 is engaged and the transmission 34 placed in a selected gear ratio. The power from the source is then through the clutch 35, transmission 34, gears 35, 38, 55 and 5|, it being understood that at this time the clutch 42 is engaged and both brake mechanisms in released position. To raise or elevate the carriage by power, the clutch 42 is disengaged and the clutch 45 engaged. The power will. then pass from the gear 35 through the gears 39, 43, 52 and 5| to the shaft l3. It being understood that at this time both brakes are released. To sustain the carriage in an elevated position, the brake band 55 is contracted on the brake drum 55 through the manipulation oi the hand lever 53. When it is desired to allow the carriage to x} move downwardly by gravitation both brakes are released and the clutches 42 and 45 are declutched.

To prevent the carriage from moving upwardly underthe action of the tool on the work, the band 55 is contracted on the brake drum 55 through the manipulation of the hand lever 53.

After work has been applied to the work holder and it is desired to operate on said work by the tool of the tool carrier I, the operator may lower the carriage by gravitation to a selected distance to bring the tool in proper relation to the work for operation thereon. The brake band 55 is then contracted on the brake drum 55 so that the carriage will be prevented from moving upwardly under the influence of the tool on the work. The tool is then set in motion or driven by the power source 25 by clutching the clutch 21. The number of strokes made by the tool can be governed easily through the manipulation of said clutch 21.

When it is desired to move the carriage downwardly by power, this can be easily accomplished by clutching the clutch 35, placing the trans:

mission 34 in proper gear so that the power will be to the shaft I! through the gears 35, 35, 55 and 5|. This may be desirable on some forms of work when it is desired to increase the action of the tool on the work. It is again desired to point out that the carriage Hi can be secured against upward movement in any of its adjusted positions by the application of the brake band 55 to the brake drum 55. Also, it will be noted that through the use of the ratchet teeth 54 and dogs 53 the shaft I5 may be driven to raise the carriage without eflecting rotation of the shaft 4|. Thus it will be seen that during the rotation of the shaft 44 to elevate the carriage, the gear 55 is free to rotate in a direction reverse to that rable power press has been provided capable of operating various types of tools, such as a punch, die or cutting device. When the device is employed for operating a cutting device the latter amount of energy to be consumed from the power sources, t

While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination and arrangement of parts" may be made without departing from the spirit and scope of the invention as claimed.

Having thus described my invention, what I claim is:

In a device of the character described, a driven shaft, .a housing receiving'the shaft, a pair of spacedreversely driven gears journaled in the housing, a gear meshing with the driven gears and secured to the shaft, a brake drum secured to one of the driven gears, a ratchet mechanism connected to the other driven gear, a brake drum connected to the ratchet mechanism, brake bands for said drums, oppositely rotated drive gears journaled in the housing, a pair of clutches in said housing and one connecting and disconnecting one of the drive gears to one of the drums and the other clutch connecting and disconnecting the other drive gear to the other drum, a

.power means for rotating said drive gears, a single. operating means for the clutches and extending exteriorly of the housing and supported thereby, and a single operating means for the brake bands extending exteriorly of the housing and supported thereby.

EMIL E. BOHN. 

